Finding the Fourth Proportional to 142,477.92, 196,619.67 and 78,820.02

Step by Step Solution

1. Step 1: Write the proportion equation
   142,477.92 : 196,619.67 = 78,820.02 : x
2. Step 2: Convert to fraction form
   142,477.92/196,619.67 = 78,820.02/x
3. Step 3: Cross multiply
   142,477.92x = 196,619.67 × 78,820.02
4. Step 4: Simplify right side
   142,477.92x = 15,497,566,321.79
5. Step 5: Solve for x
   x = 15,497,566,321.79/142,477.92
6. Step 6: Final answer
   x = 108,771.71